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更新时间:2011-12-25:  来源:毕业论文

大部分数据库系统被设计为集中式的——数据库被安装在中心,同时与各种应用程序进行连接。但有许多情况下,一个数据库必须通过配置,因为数据库可能被安装在远程计算机上,并很可能没有专业的数据库管理员进行维护。一个需要配置的数据库系统必须容易安装,在它运行时不需要管理,并且能够在多种平台下运行。 还必须满足传统数据库对规则、性能和可靠性的要求。如果用Java实现这些应用程序及数据库,则这些要求能够同时得到满足。利用这种体系结构的应用程序能够用于分布式部署,并且仍然能够保留集中式数据库系统所能提供的好处。通过JAVA实现一个数据库能够满足部署的两个要求。Java是众所周知的开发可移植程序的工具. Java程序存储为在所有平台下相同的格式,并且通过在所有平台上都一样工作的虚拟机运行。这些特点,使Java程序能够通过Java虚拟机被分布并运行在任何计算机上。因为Java虚拟机几乎可以用于所有平台,因此Java程序相当便携。Java也致力于嵌入式的要求。论文网http://www.lwfree.com/  嵌入式的意思是嵌入一个程序作为另一个程序的软件组成的能力。因此有必要在一个应用程序中部署数据库,以使应用程序更易于管理。虽然配置的问题仍然存在,嵌入可能比较简单或使用本地代码编译器较好的集成组件。但问题是,除非系统使用相同的机制管理系统的资源,否则它们将相互冲突。举例来说,UNIX系统程序使用信号标志和处理器作例外处理。除非所有的部件在系统中使用相同的约定(和不同信号),否则它们不能够同时工作。另一个嵌入和基于C的软件系统的问题是,用C或C++编译的系统不是“安全指针” 。在任一系统中的软件缺陷会彼此造成冲突。

关键词:数据库;Java;可移植程序;便携;嵌入;安全指针
Abstract原文请加六.维^论,文'网QQ324.9114
Most database systems are designed to be centralized– the database is installed once in a central location and the various applications connect to it. But there are many situations in which a database must be deployed – installed in remote locations, probably without the benefit of a trained database administrator. A deployable database system must be easy to install, require zero management while it’s running, and be capable of running on diverse platforms. It must also satisfy the traditional database requirements of standards, performance, and reliability.These requirements can be met when the application and database are implemented in Java. Applications that use this architecture can be deployed and yet still retain many of the benefits that centralized database systems were designed to provide. By implementing a database in Java, two of the requirements of deployability can be satisfied. Java is well known to be a way of developing portable programs. Since Java programs are stored in a format which is the same on all platforms, and they are run by a virtual machine which is defined to work the same on all platforms. These characteristics enable Java programs to be distributed to and run on any machine with a Java virtual machine. Since Java virtual machines are available for almost all platforms, Java programs are quite portable. Java also addresses the requirement for embed dability. Embeddability means the capability of embedding one program as a software component in another program. It’s necessary in a deployed database application in order to make the application easier to manage. Embedding may be possible for relatively simple or well-integrated components using native code compilers, although the configuration issues still arise. The problem is, unless the systems use the same mechanisms for managing system resources, they will conflict with each other. For example, on Unix systems programs use signal masks and handlers for exception handling. Unless all the components in the system use the same conventions (and different signals), they will not be able to work together. Another problem with embedding and C-based software is that systems built in C or C++ are not “pointer safe.” Bugs in either system can cause corruption in the other.
Key word: Database; Java ; Portable programs; Portable; inset; Pointer for safety

 
目 录
毕业设计(论文)任务书 I
摘 要 II
Abstract III原文请加六.维^论,文'网QQ324,9114
第1章 引言 - 1 -
1.1国内外研究现状及发展趋势 - 1 -
1.2主要特色 - 1 -
第2章 相关技术简介 - 3 -
2.1开发平台及规范 - 3 -
2.2运用框架 - 6 -
2.21 Struts框架 - 6 -
2.22 Struts体系结构 - 7 -
2.23 Struts 流程 - 8 -
第3章 概要设计与详细设计 - 9 -
3.1 运行环境及配置 - 9 -
3.2概要设计阶段 - 9 -
3.3详细设计阶段 - 11 -
3.4 数据库设计 - 13 -
第4章 功能模块简介 - 19 -
4.1前台 - 21 -
4.2后台 - 25 -
第5章 结 论 - 31 -
参考文献 - 32 -
致 谢 - 33 -2261

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